When it comes to pay per click advertising you have to find the right converting keywords. You can have an excellent landing page but sometimes the keyword choice makes all the difference. The difference is in the targeted audience.
For instance, in the “make money online” niche, you’ll find that many people are targeting this niche but not making any money. The reason is because they are targeting the wrong audience. You have to target the right audience and you do that partially with your keyword choices. One marketer in this niche says that most people in the “make money online” niche are actually targeting experienced marketers when the people looking for information on that keyword are new internet marketers or people interested in the topic. More experienced marketers will use the keyword “internet marketing”.
That’s just one example of where the keyword can make a difference. It is likely that you can find similar examples in your niche. Be sure you do the right amount of keyword research before you start spending money.

Another point i would like to add in this discussion is….try expanding on converting keywords and create a separate adgroup for those keywords and write a theme based adcopies for those adgroups. Wait and watch the game….
Regards,
FourPx
Thanks for sharing this information. Keyword targetting is a very complex and ever changing field, it can never be perfect.